Armature brush holder for electric toy dynamos



J. L. COWEN.

BRUSH'HOLDER FOR ELECTRIC TOY DYNAMOS.

APPLICATION FILED IIP'II. I5. 1920.

ARMAIURE IIIIII famed Feb. 7, 1922.

PATENT OFFICE.

f` lJOSHUA L. coWEN,` or NEWYORK, N. Y.

ARMTURE BRUSH` HOLDER: FOR,l ELECTRIC TOY DYIITYAMOS.

` To all w tomt may concern:

e. so

Be it known that'JosHUA L. COWEN, a citizen of the United States, and resident of the city of New VYork, in the county of New York and State of New York, khas invented certain new and useful Improvements I in ArmatureBrush Holders for Electric Toy Dynamos, of which the following is a specification. n

This invention relates to brush holders for armatures ofV toy motors.

In toy motors, such for example as the electric motorsnsedin toy electric cars, a brush holder. construction has heretofore been used comprising aY tube in which the brush is held anda brass compression spring mounted: in the vtube kto press against the brush and feed the samepup to the commutator and the tube'thenclosed at the top by detachable means such as a cap. Many prac' tical disadvantages and'difiicult'ies have been had with this and 'other prior constructions. Thus, the compression spring being enclosed in a closed tube poorheat radiation was obtained and in short'time the' heat destroyed the temper *of* the spring. The brushes have. further been inaccessible for thejpurpose of removal or adjustment by reasonof the location thereof. in the closed tubev and such removal 0r adjustment has entailed a tedious awkward operation by reason of having r'st to removev the top cap and then the spring before the brush is freed. This` diiiiculty is particularly had where the toy motor is used in connection with an electric car where it is positioned on a frame and cross-pieces as will hereinafter appear. The 'top cap has further given rise topractical,dihcultyv by reason of its being readily lost and difficult to replace.

One object, therefore, of this invention is to provide' in a toymotor for electric toys an armature brush holder which shall be free from' the difficulties and disadvantages of prior constructions ashereinabove enumerated. Y

Among other objects of` this invention `are to provide a brush holder of the type de-l` scribedy which shall'be readily accessible Afor removing, replacing or repairing ,the brushes; to provide va deviceof this type which shall afford good effective spring contact to feed the brush up'to Vthe armature; to provide' a toy motor brush holder which lshall h ave means for easily removing the brush, and which shall be so constructed specification 'of Lettersratent.;

Patented Feb. 7, l1922;

Application led AprilV 15, 1920. Serial No. 373,994.

as t0 afford adequate and efficient heat radiation. I f

A dominant feature of the invention is the accomplishing of these and other objects in a one-piece construction; formed from sheet metal. l

The invention further contemplates the provision of a spring constructionforf feed-V ingY the brush up to the armature which Amay be manipulated or otherwise operated without removingor Ydetachingfth'e spring 'so as ments and arrangement of parts which willV be exemplified in the apparatus hereinafter described and of which the scope of application willbe indicated lin they following claims.

In the accompanying drawings, in which is shown one of various possible illustrative Y embodiments of. this invention, y

Fig.` 1 is a plan viewpartly in section showing the brushes and brush holder in their position relative to the armature'ofan electric toy motor secured tothe frame-work of `a toy. Fig. 1 is taken along line 1-'-1 of Fig. 2. l n Fig. 2 is a sectional view. cutalongr line 2-2 of Fig. 1;

Fig. 3 is a detailed sectional view ofthe brush holder cut along line 3 3 of Fig. 2; A i

Fig. 4 is a further` detailed view of the brush .holder takenat right angles of Fig.

is shown in Fig. 5 an electric toyV Vcar cornprising the side frame members 10, 11, axles 12 andV 13 which 'carry the wheelslt adapted to be propelled bygearing 15 driven'by the electric toy motor 16. This motor and the field 17 are mounted on cross pieces such as 18 secured to the frame members, The

brush holders "19 are'mounted on a suitably shapedpiecel 20 of insulating material such as composition or fiber which is 'secured tor.' one `of the side frame members such as as by the screwsA 2`2`f-'so as to dispose the brush holder and brushes Vheld therein in operative'relation to the commutator 211of the motor. Y p f The brush'holder, an""embodiment of the invention shown inthe drawing vwill nowbe described. As will beclear from the drawing, the holder is formed from yone piece'of f material preferably sheet `brass or the like ""metalto provide strength and durability',

shaped to provide a body portion23V adapted Y to rest flush againstjthe-attaching vpiece 20,

one end ofwhich isi' turned up to. provide a cylindrical holder 24 open at both ends and alsov openlaterally as at 25 by aspace left betweenythe body portionV 23 and the free lateral edge` of the cylindrical holder. q. The brush' holder being thus lopen at both ends and at the side, adequate circulation of air around land through theL holder may thus'be had to, afford the necessary heatV radiation. The other end of the body portion' is npturned toY form the upstanding bracket ment,f .fbe'rj26 having.. a topk flange .member A2( through which passes a screw or other sup-- portingjm'ember 28 on. which iswound the coil portion '29 of a spring 30. This spring isformed with a coiled head'portionfl I adaptedto press against the end of` the-brushv Vso Aas tofeed lit up to the commutator as will bereadily understood.. It will'be noted that the spring for feeding the brushup to the y. commutator is, exposed andV does not enter into the cylindrical or ytubnlarportion in whichjthe brushis heid.' Being aus Open ofthe spring inV moving it out of contactV Fig. 2 aga-inst thetension of vthe coil porto thefairfthe' heat is readily carried away or radiated and 'does'not affect the temper of the spring. To facilitate the manipulation with the brush, the ,body of the spring is formed with anindent or notch `32 wherein a'small toolniaybe inserted so as tomove;

the .spring into'dotted'positionas shown in tion andhawayv from the'brush and beyond asto'py in Tthe .form of a projection upstanding from the body portion 23 of the brush holder. .When in Y. shown in Fig. 2 abutting the stop, the

spring tension onthe brushis easily removed andthe brush mayv beremoved and replaced withoutk interference 'from the spring as will 'be readily understood." The .forward end-of the v cylindrical brushholding portion mi 24, thatis the endnearthe armature, iscut away' at the top as at 84. to provide easy access'for a tool in removing Vthe brush by pushing the Asame out`to the-rear end or in pushingin frayed layers of the` brush away from'th'e commutator. The brush holders may be secured tov theinsulating piece this dotted position in any suitable manner. Thus, the body portion 23' may be formed'with the projections 35 adaptedto'entei the openings or slots in" the piece 20, andA bend over sc as to be secured thereto. -Y In'removingthebrush, one needs "only to move the spring 3() into dotted posi- L lt will thus b e seen that thereisprovided Vapparatus in which the several objects of this invention are achieved .andwhich 1s well adapted to meet thefconditions of practical use in connection with electric toy motors.

"As vvarious .possibleV embodiments might bemade ofthe above .invention and asV variousV changes might be, made in the embodiment above set forth, it is tobegunderstood that all matter herein set forth or shown in the accompayingdrawings isto be interpreted as illustrative and not ina limiting sense. n y

Having thus vdescribed Vmy inventioml claim as new :and desire to secure byV Letters lPate`I1t:-'y u l. Inan electric'toy motor Aor generator, an armature brush holder having a brush holding member and a spring member exy terior to said brush holding ymember adapted to bear. against .the brush to feed thelatter to the commutator 4such s rinoV member being'formed with' an indent for the manipulationthereofto move the same out'of contact with and Vaway from the brush. y

2. An armature ,brush holdercomprising a sheet of material formedwith abody porone end of said --body portion vbeing overturned `to provide a holding receptacle for a brush and theoppositeend thereof beingup- .folded to provide' a lsupporting memberfor means for feeding `the brush'tothe coinmutator.

3. Air armature brush holder comprising a sheet .of material formed with a body.por.

tion for attaching the holderto a support, one end of said ybody,v portion being overturned to provide a holding receptacle for av brush andthe .opposite end thereof being upfolded toQprovidej a supportingmmember for means for feeding the' brush to thecomwith means forfthe securing thereof to the support; A

Vtion .for attaching the holder` to a support,

lmutator, said body portion beingformed.

4. In an electric toy 4motor or generator in i combination with flat supporting member, an armatureAbrush-holder comprising a sheet of materiel formed. with. a .body Persos adapted to be flush with said support for attachment thereto, the material being overturned at one end of said body to provide a substantially cylindrical holding receptacle for a brush, and said material upstanding from the end of said body portion to provide a lbracket and a resilientk member held at one end in said bracket and extending therefrom to said brush holding receptacle., i

5. In anA electric toy motor or generator, incombination Ywith a fiat supporting member, an armature brush holder comprising a sheet of material formed with a flat body portion adapted to vbe iiush with said support for attachment thereto, the material being overturned at one end of said body to provide a substantially cylindrical holding receptacle open at both ends for a brush, said overturned portion being spaced from the body portion so as to provide a longitudinal opening, said material upstanding from the end of said body portion to provide a bracket and a resilient member held at one end in said bracket and extending therefrom to said brush holding receptacle, with the free end thereof disposed opposite one of the open ends of said brush holding vreceptacle.

6. In an electric toy motor or generator, in combination a flat supporting member, an abutment thereon, an armature brush holder held on said supporting member, and having a brush holdingfreceptacle, a resilientmember disposed'in operative relation to said brush holding receptacle and having an indent `formed therein `adapted to abut i against said abutment as and for the purpose described and specified.

Signed at New York city, in the county of New York and State of New York, this 10th day of April A. D. 1920.

Y JOSHUA L. COVVEN.` 

